2687791 has 4 divisors (see below), whose sum is σ = 2760472. Its totient is φ = 2615112.

The previous prime is 2687779. The next prime is 2687809. The reversal of 2687791 is 1977862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2687791 - 2¹⁹ = 2163503 is a prime.

It is a Duffinian number.

2687791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2687761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36285 + ... + 36358.

It is an arithmetic number, because the mean of its divisors is an integer number (690118).

2^2687791 is an apocalyptic number.

2687791 is a deficient number, since it is larger than the sum of its proper divisors (72681).

2687791 is an equidigital number, since it uses as much as digits as its factorization.

2687791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72680.

The product of its digits is 42336, while the sum is 40.

The square root of 2687791 is about 1639.4483828410. The cubic root of 2687791 is about 139.0374620832.

The spelling of 2687791 in words is "two million, six hundred eighty-seven thousand, seven hundred ninety-one".